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Thread: SLAMing questions

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Burlington, NC
    Posts
    45

    SLAMing questions

    I started SLAMing Wednesday evening. Just curious if these numbers look normal and am I doing this right? It continues to clear more and more and I think the DE has been a big help. Any idea how many more days it may be?

    My FC #s after SLAMing to a 20FC shock level each time have been:

    WEDNESDAY
    6:15 = 17.0 ppm
    10:00 = 15.5 ppm

    THURSDAY
    8 am = 13.0 ppm
    Noon = 17.5 ppm
    4:00 pm = 14.5 ppm , add 1 cup DE
    9:00 pm = 18.0 ppm, add 1 cup DE

    FRIDAY
    8 am = 18.0 ppm, add 1 cup DE
    12 noon = 16.0 ppm, add 1 cup DE
    4:00 pm = 14.5 ppm, add 1 cup DE
    9:30 pm = 12.5 ppm, add 1 cup DE


    Thanks for any insight on this process!
    18,000 gallon IG vinyl
    Hayward S220T sand filter, replaced sand 2013
    Sta-Rite pump, 1HP?
    New liner, 5/12; pool built in 1981;

  2. Back To Top    #2
    Casey's Avatar
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    Apr 2007
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    SW PA
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    10,157

    Re: SLAMing questions

    We can tell you if you are right on if you add your CYA levels. You are more than likely right on if you have seen marked improvement. No one knows how long it can take from start to finish. Some clear in a week and others can drag on for weeks on end. What I would suggest is to not let up on the SLAM and continue to beat it into submission by bringing up the SLAM levels as you have been doing.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  3. Back To Top    #3
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: SLAMing questions

    Are you backwashing each time? Otherwise, stop adding all that DE! You'll clog your filter. It just forms a thin layer on top of the sand that is finer than the sand. Picture putting a window screen over a barbecue grate. Same thing, just on a microscopic scale. If you're not backwashing it out, it's like layering screen after screen on top.

    Just watch the pressure and backwash when it rises 25% over the clean pressure after the last backwash, then add another cup of DE.

    The number progression looks good.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  4. Back To Top    #4

    Join Date
    May 2014
    Location
    Burlington, NC
    Posts
    45

    Re: SLAMing questions

    Okay, Casey, my CYA level was at 50 when I started so I don't guess that has changed. Did not check it today. Richard320, I have definitely backwashed before each SLAM and before each cup of DE. My "clean" filter pressure is at 10% and I backwash at around 13-15%. Is there a point I should stop adding DE before it is clear?
    18,000 gallon IG vinyl
    Hayward S220T sand filter, replaced sand 2013
    Sta-Rite pump, 1HP?
    New liner, 5/12; pool built in 1981;

  5. Back To Top    #5
    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: SLAMing questions

    Quote Originally Posted by mamalou23 View Post
    Okay, Casey, my CYA level was at 50 when I started so I don't guess that has changed. Did not check it today. Richard320, I have definitely backwashed before each SLAM and before each cup of DE. My "clean" filter pressure is at 10% and I backwash at around 13-15%. Is there a point I should stop adding DE before it is clear?
    Nope. Run it all the time if you want! You probably have a big enough bag to keep you going for years!

    As long as you're backwashing, ignore my last post.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  6. Back To Top    #6

    Join Date
    May 2014
    Location
    Burlington, NC
    Posts
    45

    Re: SLAMing questions

    Good. I will keep doing what I've been doing then and thanks so much for the affirmation.
    18,000 gallon IG vinyl
    Hayward S220T sand filter, replaced sand 2013
    Sta-Rite pump, 1HP?
    New liner, 5/12; pool built in 1981;

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